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C. P. SHAW METHOD OF SHAPING CUTTING RULES FOR DIES Feb. 12, 1929. 1,701,547

Filed 001?- 1926 2 Sheets-Sheet 1 I N V EN TOR.

A TTORNE Y.

Feb. 12, 1929. 1,701,547

0 c. P. SHAW.

METHOD OF SHAPING CUTTING RULES FOR DIES Filed 001;. 1926 2 Sheets-Sheet 2 ATTORNEY.

Patented Feb. 12, 1929.

TATE

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CHARLES P SHAW, OF. DETROIT, MECl-IIGAN.

' METHOD OF SHAPING CUTTILIG RULES ron urns.

Application riled wa s, 1926'. serial No. 139,880.

This invention has to do with dies be the type for blanking outshapes from sheet ma 'terial, and the invention is concerned more especially with a method of-shaping cutting I aim of this invention to provide a method of shaping the rule which is usedas a cutting edge. Themethod consists primarily in utilizing the die or punch, or both, in shaping the rule. By proceeding according to the method, the rule is very accurately shaped, since it is shaped by a die member withwhioh it is to be used, or with an identical die memher and, in addition, the shaping of the rule can be quickly and easily accomplished.

' The method is exemplified in the accompanying drawings wherein:

Fig. 1 is a plan view of a piece of metal with the design which is to be blanked out out from the metal. i

Fig. 2 is a plan view of the piece of metal which is removed'and which is to be used as a Fig. 3 is a view of the remaining metal which isto'be used as a die, the metal being severed approximately centrally.

Fig. 4 is a View showinghow the parts are placed just prior to the shaping of the rule. Fig. dis a view similar to Fig. 4 showing how the parts are brought togethert'o' shape the rule. 7 P n Fig. 6 is a plan view of the die member with the cutting ruleinserted and the two parts placed together in their original position.

F i'g. 7 is a cross sectional view of a punch die made from a single layer of metal.

Fig. 8 is a cross. sectional view taken through a piece of laminated metal.

Referring to the drawings, a piece of metal is shown inFig. 1 and the design which is to be blanked out by the die is cut in this piece of metal. The metal used is preferably steel, and the design is cut through the steel by means ofa saw or routing machine, the cutting tool kerf being shown at 2. The'piece of metal 1 which is the shape of the design which .is to be blanked out, (Fig. 2) is removed and is to be used as a punch. The remaining metallis severed, as shown-in Fig. 3. These two pieces of the die.

. The steel from which the punch and die are thus cut, isrelatively soft and a cuttingrule of hard steel is used around the edges of the die. As shown in Fig. 4:, the rule 5 is placed metal 3 and 4 are to be used as between the punch 1 and one of the severed die members. The punch and the die member are now brought together with sutiicient force so as to cause the rule to take the shape of the design, as shown in Fig. 5.

Th s operation forms, in the present in stance, one half of the cuttingrule, and the other half is formed in the same manner.

l/Vith the design shown the two halves of the rule can be formed by the use of onlyone of the members 3 or 4, but in the case of a design having a different form on each side, both of "such members will be used. v

After the rule is formed the members 3 and 4 are placed together, as shown in Fig. 6, and maybe secured, as by means of bolts, or in any other desired manner, to a base or support 6. The rule is disposed around the edges of the design and may be held in place by the filling in of a workable material 7, such as 'wood or soft. metal (Fig. 7). The punch member 1 may be secured to a support 8 in a manner similar to the manner in which the die is secured to its support 6, and the two members are now ready to blank out the shapes. The operation is in the'usual manner in that the sheet metal, or other material to be blanked, is placed between themembers and the members are brought together with the unch 1 coo aeratin with the cuttin rule 5. Preferably the punch is the movable memher. A stripper may be used to strip the blanked forms from the die member.

As shown in Fig. 8, the punch and the die may be made from a piece of laminated metal. The design is cut in the laminated metal in the same way it is cutfrom the solid piece of metal and the shaping of the rule is accomplished in the same way. In this form the punch is made by the use oi one or more of the laminations'as shown at 10. This leaves the remaining laminations 11 within the rule for holding it in place. The cutting rule, which is used, is of a thickness substantially equal to the kerf formed by the cutting tool, and when the .rule is placed in the saw kerf an accurate fit between the punch and the cutting rule is obtained. The several lamina tions are secured together before the design is cut therefrom, and When in use may be secured to a base 12. ;.Likewise the punch 10 may be secured to support or base (not shown).

The rule may be bent While itisin asoft or semi-hardened condition, and this is perhaps a desirable procedure Where sharp angleso r small curves must be made. After the rule is bent and is held in position, as shown in Figs. 7 and 8, the Whole diemember ma be subjected to a hardening treatment. his hardening treatment isnot of a great duration due to the fact that the rule is of athin material and hardens quickly, and the large body of metal is not materially affected by thetreatment, "in some cases the design may be such that the rulemay be bent While it is in the form of hardened tool or die steel.

It. is perhaps preferable t0. shape the rule by the use of the die and punchwith-zvvhich the hat I'cl'aim'is V v The method of. shaping cutting rule for dies 1 shape-m plurality of rulesmay be shaped by the use of only one die and punch member.

which comprises, placing the rule in a soft conditionbetween aydivided portion ofrthe die and apunch, bringing the portion of the dieand the punch. together with a relative movement transverse to the normal operating movement of the punch and die and With sufiicient pressure to cause the rule to take the shape ofthe punch and die, and then harden ing the rule. v

In testimony whereof- Iaafliziimylsignature.

' eH nLEs. lip-SHAW, 

